AT&T had kept quiet up until now about whether it would support the hotspot goodness that comes with iOS 4.3. With yesterday's official Apple announcement, though, the carrier has made its plans official: AT&T iPhone 4 owners can enable their handsets' hotspotability for $20/month (on top of the $25 Data Pro plan),… »3/03/11 9:30am 3/03/11 9:30am